<head>
<!-- Tests that the entire border-box is shadowed, not just the content box. -->
<style>
section {
    position: absolute;
}
#a {
    width: 120px;
    height: 100px;
    top: 110px;
    left: 120px;
    background: black;
}
#b {
    width: 100px;
    height: 100px;
    top: 100px;
    left: 100px;
    border-left: solid green 10px;
    border-right: solid green 10px;
    background: white;
}
</style>
</head>
<body>
<section id=a></section>
<section id=b></section>
</body>


